gap between teeth, looks prominent after scaling.also overbite problem.?

My cousin has her tartars removed for the first time in her life, it is clean now.but the front 2 teeth on the lower jaw quite not straight and aligned parallel to each other , causing a big gap in between.the gap became so prominent after scaling,she feels very shy and depressed.her denist said that he would just lace another tooth in between!!I guess he was talking about artifical removable tooth.she is just in her mid twenties, is it really a good idea?what kinna orthodontic treatment she needs to fill the gap for years or to implant a tooth.she is on budget now and can't afford any expensive procedure.please suggest some good methods for her with cost.she is in India, no dental insurance.Secondly what kinna procedures are required to fix gaps between all the frontal teeth and also reducing overbite to make both the jaws proportionate.
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The overbite can only be corrected with braces.However, the main problem is the huge gap, which had been there all along.You just couldn't see it because it was covered by the tartar.Unfortunately, she has a lot of bone loss already, which is irreversible.It is also harmful to go for the braces with existing gum disease.So, the best thing will be to treat the gum condition first and then decide the course of action.
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